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To realize practical wide-area quantum communication,a satellite-to-ground network with partially entangled states is developed in this paper.For efficiency and security reasons,the existing method of quantum communication in distributed wireless quantum networks with partially entangled states cannot be applied directly to the proposed quantum network.Based on this point,an efficient and secure quantum communication scheme with partially entangled states is presented.In our scheme,the source node performs teleportation only after an end-to-end entangled state has been established by entanglement swapping with partially entangled states.Thus,the security of quantum communication is guaranteed.The destination node recovers the transmitted quantum bit with the help of an auxiliary quantum bit and specially defined unitary matrices.Detailed calculations and simulation analyses show that the probability of successfully transferring a quantum bit in the presented scheme is high.In addition,the auxiliary quantum bit provides a heralded mechanism for successful communication.Based on the critical components that are presented in this article an efficient,secure,and practical wide-area quantum communication can be achieved. 相似文献
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采用原位聚合法在经修饰的不锈钢丝表面键合甲基丙烯酸丁酯-乙二醇二甲基丙烯酸酯(BMAEDMA)材料,制作了不锈钢丝固相微萃取(SPME)纤维,与高效液相色谱(HPLC)联用测定了豆腐乳中的苏丹红Ⅰ,Ⅱ,Ⅲ。系统考察了萃取时间、解吸时间、盐浓度等实验条件对萃取效率的影响,建立了测定豆腐乳中苏丹红的SPME/HPLC方法。实验结果表明,3种苏丹红化合物的线性范围为50~1 000μg/L,线性相关系数(r2)不低于0.923 2,检出限为0.303~1.808μg/L。方法的柱内(n=3)和柱间(n=6)精密度(RSD)分别不大于9.2%和16.5%,实际样品的加标回收率为79.5%~86.4%。所制备的不锈钢丝萃取头机械强度高、操作简便、稳定性好、成本低;方法快速、灵敏,适用于豆腐乳中苏丹红的测定。 相似文献
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Small angle x—ray scattering study on the conformation of polystyrene in toluene during adding anti—solvent CO2 下载免费PDF全文
The conformatiopn of polystyrene in the anti-solvent process of supercritical fluids(compressed CO2 polystyrene toluene)has been studied by small angle x-ray scattering with synchrotron radiation as an x-ray source.Coilto-globule transformation of the polystyrene chain was observed with the increase of the anti-solvent CO2 pressure;i.e.polystrene coiled at a prssure lower than the cloud point pressure(Pc)and turned into a globle with a uniform density at pressures higher than Pc.Fractal behaviour was also found in the chain contraction.and the mass fractal dimension increased with increasing CO2 pressure. 相似文献
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飞秒激光制备的全单模光纤法布里-珀罗干涉高温传感器 总被引:4,自引:1,他引:4
提出了一种全单模光纤的本征型法布里-珀罗干涉(IFPI)高温传感器。光纤IFPI传感器由飞秒激光在标准单模光纤上刻写的一对内部反射镜和腔内光纤构成,其反射光谱的干涉条纹对比度达到10dB,而插入损耗仅为0.1dB。实验结果表明,该传感器的测量温度可达1000℃,温度灵敏度为14.9pm/℃。而且在重复测量中,反射光谱具有良好的一致性,可以准确地实现高温传感。飞秒激光制备的光纤IFPI高温传感器完全由标准单模光纤构成,结构简单、成本低廉,易于连接现有的光纤器件构成光纤传感网络,在实际工程中有较大的应用价值。 相似文献
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Bulk metallic glasses are prepared in Pd4o.sNi4o.sSixP19-x (x = 0-14 at.%) alloys by a combination of flux treatment and water quenching technique. It is found that the thermal stability of the Pd4o.sNi4o.sSixP19=x glassy alloys depends on the addition of Si content. Among the Pd4o.sNi4o.sSixP19=x glassy alloys studied, the Pd4o.sNi4o.sSisPls bulk metallic glass exhibits the largest supercooled liquid region (△T = 119 K) and the highest activation energy of crystallization (283.3k J/tool), showing enhanced glass formation ability and extraordinary glassy thermal stability. 相似文献